How to Map JSON Field Names to .NET Object Properties using JavaScriptSerializer (or Alternatives)?

Use JavaScriptSerializer.Deserialize: Map JSON field names to .NET object properties

Question:

How to map field names in JSON data to field names of a .NET object when using JavaScriptSerializer.Deserialize?

Answer:

The JavaScriptSerializer class does not provide direct field name mapping functionality. However, you can leverage the more flexible DataContractJsonSerializer class for this purpose.

To map field names:

1. Add the DataContract attribute to your data object class:

<code>[DataContract]
public class DataObject
{
}</code>

2. Use the DataMember attribute to specify the JSON property name corresponding to the object field:

<code>[DataMember(Name = "user_id")]
public int UserId { get; set; }

[DataMember(Name = "detail_level")]
public string DetailLevel { get; set; }</code>

Example:

<code>using System.Runtime.Serialization.Json;

public class Test
{
    public static void Main()
    {
        string json = "{\"user_id\":1234, \"detail_level\":\"low\"}";

        DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(DataObject));

        using (MemoryStream ms = new MemoryStream(Encoding.Unicode.GetBytes(json)))
        {
            DataObject dataObject = serializer.ReadObject(ms) as DataObject;

            Console.WriteLine(dataObject.UserId); // 输出：1234
            Console.WriteLine(dataObject.DetailLevel); // 输出：low
        }
    }
}</code>

Note:

• If you want to keep the DetailLevel field as an enumeration, you can use a custom JSON converter to handle conversion between string and enumeration values.
• DataContractJsonSerializer also supports field name mapping in Silverlight.

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